My 7-segment LED Clocks

My blue 7-segment collection from LC-Led Inc. (9 to 107mm digit size):

0.56", 1" and 4" displays:

The 4" displays are really huge:

Solder side of a 4":

All 4" displays together, this clock will be enormous:

For size reference:

4", all segments lit @ 20mA LED current, as my Dimage7 sees it:

More like I see it:

4", all segments lit @ 2.5mA:

In full darkness at 20mA/segment:

Close up at 10mA/segment:

Close up at 5mA/segment:

A few pictures of the Conrad 641148 DCF77 receiver modules:



To be continued...